Acquisitions - Narratives (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended								12 Months Ended					12 Months Ended
	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2010 employees	Sep. 30, 2010	Jun. 30, 2010	Mar. 31, 2010	Dec. 31, 2011	Dec. 31, 2010 employees	Dec. 31, 2009	Dec. 31, 2011 Mexican Acquisition [Member] employees armoredvehicles branches	Dec. 31, 2010 Mexican Acquisition [Member]	Dec. 31, 2010 Canadian Acquisition [Member]	Dec. 31, 2009 Eastern France Acquisition [Member]	Mar. 01, 2010 Eastern France Acquisition [Member] employees	Apr. 22, 2010 Russian Acquisition [Member] employees
Business Acquisition [Line Items]
Previous Ownership Percentage of Acquired Entity												20.86%
Additional Percentage Ownership Acquired												78.89%
Non-controlling interest held by third party												0.25%
Acquired entity number of employees					125					125		12,000				100	50
Acquired entity number of branches												80
Acquired entity number of armored vehicles												1,350
Gain or loss from previous ownership relationship					$ 8.6					$ 8.6			$ 13.7
Sales Revenue, Net	$ 997.1	$ 995.8	$ 979.3	$ 913.3	$ 880.6	$ 776.1	$ 729.4	$ 735.4	$ 3,885.5	$ 3,121.5	$ 3,135.0			$ 48.0	$ 13.0